The new document will return to teaching those lessons, but in some cases will do so when students are older.

The curriculum will also include teachings on cannabis and concussions.

Education Minister Stephen Lecce said in a statement that the new teaching plan will “keep kids safe in and outside of the classroom.”

Parents will be able to opt out of having their children exposed to certain topics in the sex-ed class, such as “human development” lessons, and the government will issue online resources for those who want guidance on discussing those topics at home.

Watch: Ontario students staged a walk-out last year over the sex-ed curriculum. Story continues below.

“Parents are the primary educators of their children and are their children’s first role models. It is important that schools and parents work together so that both home and school provide a supportive framework for young people’s education,” said a statement from the curriculum’s overview.

The province is requiring school boards to have an exemption policy by the end of November.

The government is also boasting that the curriculum includes enhanced teaching on mental health and “social-emotional learning skills.”